Some negative effects of population growth are insecurity, crime, unemployment, underdevelopment, inequitable sharing of resources and increased pollution of the environment. These negative effects lead to subsequent problems such as clashes and fighting for dwindling resources, poor sanitation and drug abuse.
Overpopulation is the existence of more people than the available resources can support. As of 2014, most countries in the third world are faced with the problem of uncontrolled population growth. If not checked, the challenge could lead to starvation when resources are depleted. As people occupy the available land, there will be virtually no land to cultivate. Overpopulation is also referred to as proliferation of population or population explosion.